EP 0255407 A2 19880203 - Method and apparatus for removing pseudo-sync and/or automatic gain control pulses from a video signal.
Title (en)
Method and apparatus for removing pseudo-sync and/or automatic gain control pulses from a video signal.
Title (de)
Verfahren und Vorrichtung zur Entfernung von Impulsen für die Pseudosynchronisierung und/oder A.V.R. aus einem Videosignal.
Title (fr)
Procédé et dispositif pour enlever les impulsions de pseudo-synchronisation et/ou de C.A.G. d'un signal vidéo.
Publication
Application
Priority
- US 83601986 A 19860304
- AU 7868887 A 19870921
- GB 8721751 A 19870916
- EP 87308207 A 19870916
Abstract (en)
Added pseudo-sync pulses and AGC pulses are removed from a video signal to enable acceptable video recording thereof. The added signals previously interfered with acceptable video recording of the video signal because the automatic gain control of videotape recorders sensed false recording levels, while conventional televisions receivers were unaffected by those modifications to the video signal. Removal of the added pulses permits acceptable video recording of the previously modified video signal. A selectively-operable clipping circuit is used to remove selected negative-value components (i.e., pseudo-sync pulses) from the video signal, while added AGC pulses are effectively blanked from the video signal with an electrically-operable switch. Both the blanking and clipping functions are selectively achieved by sensing both the normal sync pulses of the video signal and the added pseudo-sync pulses. Method and apparatus are disclosed for "cleaning up" video signals modified by the pseudo-sync pulses alone, the AGC pulses alone, or combinations thereof.
IPC 1-7
IPC 8 full level
H04N 5/91 (2006.01); H04N 5/913 (2006.01); H04N 7/167 (2006.01); H04N 7/169 (2006.01); H04N 7/171 (2006.01)
CPC (source: EP US)
H04N 5/913 (2013.01 - EP US); H04N 7/169 (2013.01 - EP US); H04N 7/171 (2013.01 - EP US); H04N 2005/91314 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0255407 A2 19880203; EP 0255407 A3 19880810; EP 0255407 B1 19891129; EP 0255407 B2 19950322; AT E48356 T1 19891215; AU 600522 B2 19900816; AU 7868887 A 19890323; DE 3761073 D1 19900104; ES 2012486 B3 19900401; ES 2012486 T5 19950816; GB 2195510 A 19880407; GB 2195510 B 19881207; GB 8721751 D0 19871021; GR 3000351 T3 19910607; US 4695901 A 19870922; US 4695901 B1 19901002
DOCDB simple family (application)
EP 87308207 A 19870916; AT 87308207 T 19870916; AU 7868887 A 19870921; DE 3761073 T 19870916; ES 87308207 T 19870916; GB 8721751 A 19870916; GR 900400086 T 19900215; US 83601986 A 19860304